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  <title>Make unified diff of two files</title>

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</div><hr /><div id="function.xdiff-file-diff" class="refentry">
 <div class="refnamediv">
  <h1 class="refname">xdiff_file_diff</h1>
  <p class="verinfo">(PECL xdiff &gt;= 0.2.0)</p><p class="refpurpose"><span class="refname">xdiff_file_diff</span> &mdash; <span class="dc-title">Make unified diff of two files</span></p>

 </div>
 
 <div class="refsect1 description" id="refsect1-function.xdiff-file-diff-description">
  <h3 class="title">说明</h3>
  <div class="methodsynopsis dc-description">
   <span class="type">bool</span> <span class="methodname"><strong>xdiff_file_diff</strong></span>
    ( <span class="methodparam"><span class="type">string</span> <code class="parameter">$old_file</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$new_file</code></span>
   , <span class="methodparam"><span class="type">string</span> <code class="parameter">$dest</code></span>
   [, <span class="methodparam"><span class="type">int</span> <code class="parameter">$context</code><span class="initializer"> = 3</span></span>
   [, <span class="methodparam"><span class="type">bool</span> <code class="parameter">$minimal</code><span class="initializer"> = false</span></span>
  ]] )</div>

  <p class="para rdfs-comment">
   Makes an unified diff containing differences between <em><code class="parameter">old_file</code></em> and
   <em><code class="parameter">new_file</code></em> and stores it in <em><code class="parameter">dest</code></em> file. The
   resulting file is human-readable. An optional <em><code class="parameter">context</code></em> parameter
   specifies how many lines of context should be added around each change.
   Setting <em><code class="parameter">minimal</code></em> parameter to true will result in outputting the shortest
   patch file possible (can take a long time). 
  </p>
 </div>


 <div class="refsect1 parameters" id="refsect1-function.xdiff-file-diff-parameters">
  <h3 class="title">参数</h3>
  <p class="para">
   <dl>

    
     <dt>
<em><code class="parameter">old_file</code></em></dt>

     <dd>

      <p class="para">
       Path to the first file. This file acts as &quot;old&quot; file.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">new_file</code></em></dt>

     <dd>

      <p class="para">
       Path to the second file. This file acts as &quot;new&quot; file.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">dest</code></em></dt>

     <dd>

      <p class="para">
       Path of the resulting patch file.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">context</code></em></dt>

     <dd>

      <p class="para">
       Indicates how many lines of context you want to include in diff
       result.
      </p>
     </dd>

    
    
     <dt>
<em><code class="parameter">minimal</code></em></dt>

     <dd>

      <p class="para">
       Set this parameter to <strong><code>TRUE</code></strong> if you want to minimalize size of the result
       (can take a long time). 
      </p>
     </dd>

    
   </dl>

  </p>
 </div>


 <div class="refsect1 returnvalues" id="refsect1-function.xdiff-file-diff-returnvalues">
  <h3 class="title">返回值</h3>
  <p class="para">
   成功时返回 <strong><code>TRUE</code></strong>， 或者在失败时返回 <strong><code>FALSE</code></strong>。
  </p>
 </div>


 <div class="refsect1 examples" id="refsect1-function.xdiff-file-diff-examples">
  <h3 class="title">范例</h3>
  <p class="para">
   <div class="example" id="example-2388">
    <p><strong>Example #1 <span class="function"><strong>xdiff_file_diff()</strong></span> example</strong></p>
    <div class="example-contents"><p>
     The following code makes unified diff of two php files with context length of 2.
    </p></div>
    <div class="example-contents">
<div class="phpcode"><code><span style="color: #000000">
<span style="color: #0000BB">&lt;?php<br />$old_version&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'my_script.php'</span><span style="color: #007700">;<br /></span><span style="color: #0000BB">$new_version&nbsp;</span><span style="color: #007700">=&nbsp;</span><span style="color: #DD0000">'my_new_script.php'</span><span style="color: #007700">;<br /><br /></span><span style="color: #0000BB">xdiff_file_diff</span><span style="color: #007700">(</span><span style="color: #0000BB">$old_version</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">$new_version</span><span style="color: #007700">,&nbsp;</span><span style="color: #DD0000">'my_script.diff'</span><span style="color: #007700">,&nbsp;</span><span style="color: #0000BB">2</span><span style="color: #007700">);<br /></span><span style="color: #0000BB">?&gt;</span>
</span>
</code></div>
    </div>

   </div>
  </p>
 </div>


 <div class="refsect1 notes" id="refsect1-function.xdiff-file-diff-notes">
  <h3 class="title">注释</h3>
  <blockquote class="note"><p><strong class="note">Note</strong>: 
   <p class="para">
    This function doesn&#039;t work well with binary files. To make diff of binary
    files use <span class="function"><a href="function.xdiff-file-bdiff.html" class="function">xdiff_file_bdiff()</a></span>/<span class="function"><a href="function.xdiff-file-rabdiff.html" class="function">xdiff_file_rabdiff()</a></span> function.
   </p>
  </p></blockquote>
 </div>


 <div class="refsect1 seealso" id="refsect1-function.xdiff-file-diff-seealso">
  <h3 class="title">参见</h3>
  <p class="para">
   <ul class="simplelist">
    <li class="member"><span class="function"><a href="function.xdiff-file-patch.html" class="function" rel="rdfs-seeAlso">xdiff_file_patch()</a> - Patch a file with an unified diff</span></li>
   </ul>
  </p>
 </div>

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